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The use of recycled materials such as recycled concrete aggregates (RCA) and tire-derived aggregates (TDA) in the subbase layers of pavements is gaining attention. Though multiple studies have utilized experimental methods to study the behavior of pavement mixtures with recycled materials, limited studies are available regarding the mechanistic analysis of such pavement systems. Thus, the major objective of this study was to develop a framework for numerical simulation and analysis of pavements comprising RCA, TDA, and a combination of RCA and TDA in the subbase layers using the finite element analysis method (FEM). The results indicated that the pavement deflection was reduced by a range of 4.7 to 16.7% with a blend of 1–2% TDA along with 98–99% RCA, compared to the conventional granular subbase. However, the vertical strains increased by 15 to 39%, which increased the risk of rutting. It is envisioned that this study will promote the use of recycled materials in pavement subbase applications, thus paving the way to create sustainable roadway infrastructure.

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A Preliminary Framework for Mechanistic Analysis and Design of Pavement Subbase Prepared with Recycled Aggregates

  • 会议论文

  • 发表日期：

    2025年

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  • Neetu Gopakumar,
  • Krishna Prapoorna Biligiri,
  • Avishreshth Singh

摘要

The use of recycled materials such as recycled concrete aggregates (RCA) and tire-derived aggregates (TDA) in the subbase layers of pavements is gaining attention. Though multiple studies have utilized experimental methods to study the behavior of pavement mixtures with recycled materials, limited studies are available regarding the mechanistic analysis of such pavement systems. Thus, the major objective of this study was to develop a framework for numerical simulation and analysis of pavements comprising RCA, TDA, and a combination of RCA and TDA in the subbase layers using the finite element analysis method (FEM). The results indicated that the pavement deflection was reduced by a range of 4.7 to 16.7% with a blend of 1–2% TDA along with 98–99% RCA, compared to the conventional granular subbase. However, the vertical strains increased by 15 to 39%, which increased the risk of rutting. It is envisioned that this study will promote the use of recycled materials in pavement subbase applications, thus paving the way to create sustainable roadway infrastructure.